Question

Give reasons
i) Birds can fly.
ii) Fishes have a streamlined body.
iii)Muscles make the bones move by contraction and expansion.

Answer 1

hey! mate here is ur answer
1) birds can flt because they have hollow bones which makes them lighter in weight and they have feathers which helps them to fly in air
2) fishes have streamlined body which helps them to swim in water. This streamlined body shape makes them easier to swim as they have two end points and the water can easily pass by there body and this makes fish easier to swim


hope it helps

Answer 2

Hiii Madiit,

{i} Birds can fly.

ans. Birds can fly because of their wings, which are modified forelimbs. The bones o the birds are hollow and very light, making it easy for them to rise in the air. Strong musceles in their brestbones help birds to flap their wings and fly.

{ii} Fishes have streamlined bodies

ans. To help movement in water, fishes have streamlined bodies -- broad int he middle and  narrow at the ends. this reduces the water resistance and enables the fish to glide along in the water.

{iii} Muscles make the bones move by contraction and expansion.

ans. The up and down movements in your arm are controlled by two muscels-- biceps and triceps. When you want to raise your arm, the biceps in front contract, that is, they become shorter and fatter to pull up the arm. The lower arm, the triceps at the back contract and pull it down

Hope it helped you!

-Zeezee